<blockquote><font class="small">In reply to:</font><hr>
It is inevitable that the oil supplies will be used up.
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This is simply not true. Its a black/white view of the world we live in.
Oil will become increasing scarce. Provided we have found all the reserves on earth (and there is considerable debate about that), as we pump oil we will gradually deminish the available supply (again the rate is a matter of debate). At some point, it will become financially impractical to continue using petroleum fuels for the transportation of the masses. However, the supply will still be there and in a perfect system the supply would dwindle and the price would keep going up. You would eventually reach an asymptotic condition. There would be a supply, but it would be impractically small. From an economic persepective, petroleum's use as a mass fuel will cease long before the available supply is gone simple because market forces will drive us to other fuels. You might not want to pay 10 dollars a gallon for gasoline, but you might not mind 15 dollars for a jar of vasoline or 10 dollars for a quart of oil. When petroleum goes up to 4 to 5 dollars a gallon in the US, alcohol becomes cost competitive. The conversion is inexpensive and many will go this route if an infrastructure exists.
As far as pressurized fuels go, there is no infrastructure to support this type of fuel. I can't see every mom and pop fuel station getting a big hydrogen tank (or propane tank). Compressed natural gas might be OK since we already have a delivery system in the ground, but you have to compress it to a liquid to get enough in a vehicle to be useful.
So far, the hybrid electric seems most favorable in the short term. Pick your liquid fuel to run the electric generator.
I don't see a near term future in the total electric car. Unless there is a significant breakthrough in battery technology then the energy density of batterys just doesn't work except for real short commutes. (and we generate electricity by fossil fuels anyway)